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The National Institute of Technology,Okinawa College has developed a milling flour machine of rice using the underwater shock wave.The rice flour by this method was high quality compared to the general milling method[1].The rice flour production machine is composed by the pressure vessels for milling,and the high voltage generator,the circulation and filtration device of the water.In this report,in order to realize a highly efficient milling,the propagation of the shock wave in the pressure vessel was analyzed by computer simulation.The experiment and the results of the particle velocity of rice for analysis is shown.The results of numerical analysis based on the particle velocity is shown.